Preheat and Prep: Preheat oven to 200°C (convection). Drain hearts of palm and pat dry with paper towels. Cut each stalk lengthwise into 3-4 flat "steaks." Place on a plate and drizzle with 2 tbsp olive oil, smoked paprika, cumin, pepper, and salt. Rub gently to coat all sides.
Start Quinoa: In the rice cooker or saucepan, combine rinsed quinoa and water. Cook according to rice cooker instructions or bring to boil, then simmer covered for 15 minutes until fluffy. Set aside.
Roast Vegetables: On a baking sheet, toss bell pepper strips and cherry tomatoes with 1 tbsp olive oil and salt. Spread in a single layer and roast for 18-20 minutes until slightly charred.
Make Citrus-Herb Drizzle: While vegetables roast, whisk together parsley, lemon juice, 3 tbsp olive oil, minced garlic, oregano, salt, and pepper in a small bowl. Set aside to let flavors meld.
Toast Quinoa Farofa: Heat 2 tbsp olive oil in a medium pan over medium heat. Add diced red onion and sauté for 3 minutes until translucent. Add minced garlic and sunflower seeds, cook 2 minutes more. Add cooked quinoa and salt, stirring constantly for 3-4 minutes until quinoa is lightly toasted and fragrant. Remove from heat.
Grill Hearts of Palm: Heat grill pan over medium-high heat. Place hearts of palm steaks on hot pan and press gently with spatula. Grill 3-4 minutes per side until golden grill marks appear and edges are slightly crispy. Remove from heat.
Assemble Plates: Divide toasted quinoa farofa among three plates. Arrange 3-4 hearts of palm steaks on each plate. Add roasted pepper and tomato medley. Garnish with sliced avocado and drizzle generously with citrus-herb sauce.